Antenna



FIG. 1 is a top perspective view of an antenna, showing my new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a front view thereof; and,

FIG. 8 is a rear view thereof.

The dashed lines in the drawing views depict portions of the design that form no part of the claim. 

CLAIM The ornamental design for an antenna, as shown and described. 